How to Create Customizable Input with Prefilled Values in Python?

Customizable Input with Prefilled Values

When working with user input in Python, it can be convenient to provide a default value that users can easily edit. However, the standard input() function only allows for a blank prompt.

Default Value for Input

To create a user input field with a prefilled default value, the readline module can be utilized. readline provides advanced line editing capabilities, making it possible to set a startup hook that inserts the prefill value.

Custom Input Function

Here's a custom input function that uses readline to achieve the desired behavior:

<code class="python">import readline

def rlinput(prompt, prefill=''):
   readline.set_startup_hook(lambda: readline.insert_text(prefill))
   try:
      return input(prompt)  # or raw_input in Python 2
   finally:
      readline.set_startup_hook()</code>

Usage

To use this custom input function, simply call rlinput() with the desired prompt and prefill value. For example:

<code class="python">folder_name = rlinput('Folder name: ', 'Download')</code>

This will display the prompt "Folder name: Download" with the default value "Download" prefilled. The user can then edit the value as needed by adding or removing characters.

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